Question 150718
A quadratic equation contains its highest order term in the form {{{x^2}}}

Any expression that fits that form, is quadratic. So pick something that is easy to evaluate. How about
{{{x^2 - 3x + 2}}}  
Then plot it by using x values of -2, -1, 0, 1, 2

{{{graph(400,400, -10,10,-10,10, x^2 - 3x + 2)}}}


A polynomial with three terms can be almost anything. Just make sure there are three terms in it. In fact, the quadratic equation we just did have three terms in it. So something like that is fine too